These unusual sparkling wines are, for some peculiar reason, very much on trend but the méthode ancestrale (where a single fermentation takes place under pressure in bottle using the natural yeasts and sugar present and no dosage) actually pre-dates the 'tradtional method' of Champagne, Cremant, Cava etc which uses a second fermentation to make the bubbles. Don't expect the clarity and finesse of a Champagne, these characterful wines instead have exceptional texture and depth of flavour.